Backtrace from kernel to user space in coredump

[Michael Eager]

Hi --

I want to be able to generate a backtrace in a
core dump from a uClinux kernel routine (say,
do_trap() or do_page_fault()) to the user-space
routine which caused the trap.  The kernel function
is called with a pt_regs struct which contains the
user regs.

One way I thought to do this is to set the $PC and
$SP to the value saved in pt_regs and do a "bt".
If I try to set the $PC, gdb complains that there
is no process, since there are no routines to modify
a core file.

I can modify gdb to save the registers returned from
reading the core file and add routines allow modifying
these saved register values.

Are there better ways to do this?   How have other
people handled traces back from kernel to user space?


-- 
Michael Eager	 eager@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077